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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be5a98e97c58eb5bf65444282f9f26fc9c4586cf5ab1b9dd3619de690f44ead' 
  AND token = 'xrPaMDGOJ9exakXeFBBMuy1eByoatjVk3+s4/Ekan64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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