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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd483c582b6cb741d600c9e8c6ee37aaae5460e0a3a67e19d6e57fe9390ed39de' 
  AND token = 'sT5+Sd/OypfOWifK1h95wA/e5A//zmysiyzx5CpBIR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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