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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1b1d080ba5924225ee83791d526ab8d00c8373e91b6383d74cd6cd6002e233' 
  AND token = 'al3LtN5IkNIkCjCw8RaGXBqifU2TzMJoetuWLnDu31w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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