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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594b645e268936b55b615038583b381bff17295f695c59aab7bfe942aee46a2e' 
  AND token = '9oM/coSetKW/M4UhT+v7kystHhIIAqmUrCa7AafUahE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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