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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46591cb7631c581b6379f78c3eeb8f06b3a97f92e7b1e69973a8a6c81fb80d7' 
  AND token = 'DPSAPixiUTiMead2WQx5NXFyZgg3XwS2eK1fpqZeK+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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