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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f36f458f883e3c7e9f1942b3fd3ada564a5337ee57339fe204366b1041a5855' 
  AND token = '2TDwcvmX+WW3vmLbPvZZX14saGDHGAYSQ6DyIBdKB60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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