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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece336c431244e972a4b93b21bcfb8be8036c97a2a03d51c2bbf5b01cb7ae8f9' 
  AND token = 'u3f5Swm6SJIxkGHoT0Xt4tKfiuOxCYFkD2sLoDd9mok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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