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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d56c4506d9f3cc1f61d09ab8313463851d360fd37cc2d9ad5376d49207930f4' 
  AND token = 'rNuilPTfjF6RmhzJXLixEceSpL8WYMZrm4map3T9t7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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