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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94108a7ea17029a471f236136eb12edc0d364aaf65515cacb0c7f1f05e136193' 
  AND token = '/CqbTFZ5KoEJoDNK5ioO+4uek9Sp8CC/NxJ/LHVFDRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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