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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363d7302b2e333a7704035778145a954b97d8a903bd6f60de138e03217ac2eee' 
  AND token = '7RTnLEL1Vs39+QlRbTgrLhHR6lrYRG1VEwh/WCeuZO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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