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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403a52dca52ccd7cd7ea68204f44da8f49993a4f438c2601556ccceaf382d763' 
  AND token = 'YcH/rtzfzPXa1clSPhA9Shx9+wk1QWvzcX4jWJRPwJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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