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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2ce128c9115188bf4ec37bc179eae572c084f7953354fb508362489b84a029' 
  AND token = 'dgj4835MPDuNvc3TI2OJ0d0u65umabNwslQh3V50CwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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