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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0139b69a8d912fc46ccb2a9623c5edee5ca67679dc7729cfc3bbc3f3d0eca67b' 
  AND token = 'ZJDDE12Gdwn/3k0poxBB3y1qzEX/6YwW8o/rdlJXsDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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