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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263686d276377cc29f1590dedc46b46534036f6de273644e53b2c2ff66fca8ed' 
  AND token = 'gGPDPIMOwyuu4cLiyFDh6lyJL+T6D5TG3bQ5Z3WiwHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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