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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6547f0eec2a7ace06905391cff3e3ec58f3e9052117810f197072c3d5d50a860' 
  AND token = 'bMBqSvE8uhUm62FO+JqJQFWjNNuI0nj+/7hpx1LQVSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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