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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa709aeee8872c14edf5fb7895d9d8b0eda0e9fb7e7368eaaae849e02cca607b' 
  AND token = 'sRcZDkr73Vv1YK6GALC5Njx0q+HTRUTHdUQzqtpOPUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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