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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b019abd829de141b0e6ec637f0da98ba5316ed2ffe8d857f5493bdc0677a49df' 
  AND token = '0fwf41exrAQu6AjgXFK7+P+TiACxdWJNHm91qEZ94ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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