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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6617883af8f93f25b39ca2c10daa100ab2c10225a37a0419ae6d8cec10ca24af' 
  AND token = '0D9527iRt0lMhn8HCvFhHL7KNsufbvNilUjgrT9SCu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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