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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9c6a62a32a67df18d3c5c1ca600a5549e37ab1f9e590e4597b85cd5262a64f' 
  AND token = 'W2vFtonWQT7scJMQl7GBw0XgCYPPGY8itsQ+GVbPT7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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