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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51e4f34afe870ef13c841650e851abdb7432b3697874c5ff9d1ffacb3c4ae02' 
  AND token = 'xgH4STgJnRaKrecquwuZwWAYQsmMYiZgWMqCao+s7ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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