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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6b92207febc9c12ba0e41ad5ec51dc18c3ffec843d667c717ac7e5f4cbfb16' 
  AND token = 'uBACjwrAQD2x2ybsbemM7IpVjl1lNRnPym6D3W+blws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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