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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff17a640efed92eff6b2efed33a4b060a335eb8cb6e7b7d279f50b5488fd7ea' 
  AND token = 'W0DpXRiVwZQ4Dwh7nVS2lU6WWKDcGNhSAUphTA07GrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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