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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869b3e12ec8ba2c1b2d6f427ac0faee608bf9725c6d1e380c3731e96ae1d9531' 
  AND token = 'y8pAIj0WjmRPCDjVImoa6tzQhdFQezXaE2JMBifR35s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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