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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbd1c31566a17593c247ff48af6c718887c1eef950a69da71c0c5ad92cfb3d5' 
  AND token = 'Xqhg7bpoq0KHnh6zhLUhuug692uF76wWDrAUmvORO2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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