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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f1c6cdf93055fb6561097f9b8ddcdfc0bf7a40fca382e8ebed65235cb6276f' 
  AND token = 'W68Q0eCfuiUr+TlR2AifrjY5zR5fvd1dzyTC5lHsMnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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