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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0dfb5ee9efcb72ac8627a95a939d39731631e32f8347b0d54a4e1803d71391' 
  AND token = 'u7MxEPBrKCWYfLoOgbitoF+rbq094jsnqAADt2wp398=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}