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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4974eb2b0f191680744fa3c2b619cd6a6cf883718e0ee00a776b2a211ee0a7' 
  AND token = 'sjwb58kSrOjapDkR5ttvhJz/QR9KiDSE/PM9bl3eme8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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