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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e5f72bee24579644ad0a2fb11eefdc4a310690e9bce63d7c3cea0b5d3c70c8' 
  AND token = '7qeC81JJV12FPn5ExaTOuA1lX8mNoiJqzJCmsDfBfLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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