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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb25b01dc4253bfa29c3035323d114318b8d8bd0cc7212f8bcc5ccb3f110d986' 
  AND token = 'vrKg6hfbvAbqN8lbRi6tPlEfnlePh/JE3szqUWAcJg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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