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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ece929ca0723f0da875e2615bdceee5c00403086195688e6b7ff8189dae6a41' 
  AND token = 'V7UW3nf3ywd9TR0FcXRKvryGNRPLPR163CVh1vUL/08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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