SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2989e34ff6e8302d98303f9690491bbfd4eb4cf926cd8d8557d7d32daecd6d0c' 
  AND token = 'oZ2/jShuutqMJBh6Vmm3YUJgGC/zXvo5XKolggvncSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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