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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229609e23be748e6893c17177f1270b255e855149fef90493e85e2059ed5e8fe' 
  AND token = 'f8y74fRJ45oWsYdR/IkuKRO0j68nwzA53wKEX0Ow0AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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