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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca29041c6f17b1c66e0eb764acbb06edc9770a2e1864b441191f0876fb3d26cd' 
  AND token = 'rl7haCALRivYSuAev0H28GsvmecnCqS3kH5bb23vTto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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