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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad88b60b0dff9377ef4aec39950722c07ed84cc259c472815adfaa83e696712' 
  AND token = 'C6jy97qCXzYKCaun8ztVfqaiPuj2+2rNangLz/TU0uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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