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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b46f4213404df41b4323f90358ef81fab55c10466cac8b0c9048659ed5e8d35' 
  AND token = '7dcWFaAWI3dacsn/5H3ALCJTGVwZmDwH6r0Jz197idg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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