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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f43fc8680de1d25b0ee86f1784c02112c9cf8709e346fee406fe9b3971d4e6e' 
  AND token = 'kob1+cMgJjJq2hwcHBT5Wl4VBwom7tpkfr1/NfqyCYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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