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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f232a6e96e0714fe32abff21ce832000352da7e5f1997a05eaa7cc15c1868074' 
  AND token = '6HZbtvA7r/vViFCvZTtzMmQAGlJRi9PbpcHXYnHUJMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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