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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ed364829265347315eae4e056adb5eb2b2079e8d3da31277e19c094d52c7ca' 
  AND token = '83Gea6T2FGnZL6KM/YnoyqJtPb32ou2Gde2qpEnAUkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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