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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4e9f0de9bcc78933988d3943034fae2cefc20303f5f0eeeb8bbab8637c1081' 
  AND token = '0tfUW/DWwMI+vIBZq0+iq8jMA3P95P3jo+8wpklahxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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