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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbf2d4127b65f0316937b531c4ae0d81983f0240a76cf719813abb4df4bf249' 
  AND token = 'kFXL4a3VpHamfL311RXT1l7brL26N2o8zHY/VvSv61E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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