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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33177947ef657371b114e5d35f6234e569982d7b6daeae2189e05c59482abf0a' 
  AND token = 'F3Xd7p4h/++mAw94abGnUKH2emWceQtwJN1/ZR73O5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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