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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f132ae86c949822d8ec37235e3e17a02d5099097da60a8aba23146f9f4817d14' 
  AND token = 'doWtE/8qcW5qCh0+2Wa+hA8oMVJK6jJInFQmKKb7iiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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