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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0331ad6ce9a6475bb0f2c695fd4634d9052bfd46b5b2b018e53ba6a4a907078a' 
  AND token = '8GeEkflo7Taq0sKdiQYf5Y45P6TfXKwvMiz8sJXOUk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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