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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3032d013b6c7322f246d7ba965689303786b165df71895154ec32b91852a9c79' 
  AND token = 'N78F2gMNAnjPVhCi42inUVBthNWkcRNmPQsk2SFkqyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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