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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47eefb61dda0e7d8c08090f3f55894d539c7602de81f1e697184a478304a1234' 
  AND token = 'KQpReH+/1AeyRQRTzq91qJwzn+h50bDknMB7eOwyLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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