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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ebbf3f4a8ba2dec848b688d8d5fca5f951c49f5ba88d66a87d583ec1b7e428' 
  AND token = '7C894E/NrvNDV2rfY4FEVWYVdFIM+T4bqAOcy3GIIu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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