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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc5b99532ca58b595776c5dc0bf6b8be0d8267bf9f2aaf607d1941ce94e9b0a' 
  AND token = 'PokZHS0B4QOk/Xn2S/Vqe9cJ8+e9NOR6M0RTytAplZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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