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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a03979b136d7d895954766e7a19df2f9edb8c0b22533aa2ddd6fae6e0e833b8' 
  AND token = 'tmdoSepmckCc3unqRU2kze9jxUu1LEERHxi1VZUFzBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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