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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d71a8d4cadf44b48f34d8d6cbf58101c2aa3944ccd3d0432f41482afa564dbc' 
  AND token = 'UjnmK1LOz/21H1lzWKKyluLif6BOm/syAMGSxaR/lH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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