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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4260c58d625838840a126df49c4002176d12383800e0a90d9bfe103e70f0f04e' 
  AND token = '5N7o3/F0u98je6JNt9EquXLR6MqimjFSxUaAzDgpkas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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