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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e735ae6b72c5ecc3df2830c403767e91ff5115b9521560e03e77a0a5ad5e11' 
  AND token = '9ShcpCDfdnKyWEituvlx3FB2D6Pe0fJI/A1k7LOxF+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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