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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6ac247f937f2b0116c87b38f3674935c281cf6e4b22ebfcadffca5a6213d2d' 
  AND token = '3DvzTVQaWkx5ro7v1YWapXGJ7mnQUWF0ahqzsUbhoo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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