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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b1e76cb6188b8901a0f1235c7fc716adee645a9f30dabb01476525b0a1b9b4' 
  AND token = '8zdG15XyKucZF1+S8CkOKoOQqwXqFTipSPG2vPUkg2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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