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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8429677a4e879c8a0a209a9ee1ff4fb1bb16ec81a6fb0c827d5aec4e10fa8bd' 
  AND token = 'csIVtckKlVaXBn3oLEwuOekAaeEEn6dLYQq1yhVPfNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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