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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e21c0f366be1ff0053b6245190e3322b7f783be5507ef3044e0a25f0ef9e2c' 
  AND token = '0zgA71GTcEjxochPLlAQLIBHfg6P6eNx/F3KUTm+jqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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