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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656ff202ae48679f8e4615a24a31e608594956f0e582ef45ed83a4827f47b549' 
  AND token = 'lqqc2ZVm2O5uY+wf4Wsptof6dKSrNhpEZ0M1+Jk3QlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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