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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad6f444c4939d1426a3a2be2bf08a9228607c12c6619e1207fba58138d55458' 
  AND token = '85/cetEFqJ/7rS1BJi18cBu2OePRaTfjb7cTBT89tOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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