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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df6db3c6487050690c361c42b359e27e151d4b471395640a2b65f7891763704' 
  AND token = '+t7LD8pWA5ISksAgJIap5ZGEDbJodQmmr3fbF1o92xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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