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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60902fdc84be434780cd303499b533029d4933d23f7d58f2e73b532ac9e4f99e' 
  AND token = '/44xH/QK+DHrF7ILd4vwtRkcC+FUlrg0/XqhVGfzk60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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