SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e74a5952ae7a4d6b7414ecff2dc73e1db89c8a8564d7549735165300c40f17c' 
  AND token = '60jhhSCeZ8giPcVJUblhuFpBvVSRFKxKd/ssjxPlS1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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