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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad365f4041333cedd14e20defd076d9e4024a8aac9a7c6a0d82206347fd6b37' 
  AND token = 'wr4J/xVGyhFzaiJndcruxo9ara8hAs/sA/Ydjmfln4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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