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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904bb5de95978e2d817ac13660467bfb6f8c3634eca4747d9a6ef07fedc4c0c9' 
  AND token = 'intY9BOM9VZcIgD0o0ehfS+KTzZF+CoP1fhvN9c0ZBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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