Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09a0aff4e1fe9dc9cf03c2ba19b7a4410ad58c0a0f5ce59da0e9698dc4ee901' 
  AND token = 'X+2P/+cD+WYEiZvdaiLJLEdkgqUmp9W3WUTZm3t8xVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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