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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d47c098b2ef1be95e5e3f4ff138e7690ccc50d84ee557c64c9e3ee4052e372c' 
  AND token = 'm8B+T5sTHNmQfZT7Z9yQgmOQWIn0evvweYJ1zOicOi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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