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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2be2ff50ce56553133ba6de85ad8fc31a33ff905340e48a7b91c14eedd3f81' 
  AND token = 'yXOXgMlK14J4EmedKRz6ks6DF7AwAi+wDpUDUstgDLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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