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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cbf22cc2f3fef901909fb6c18311c9f8e70db6e1a6370656b167ee2c73f20c' 
  AND token = '994nlFZqjfbvITVZ+39XRkKf0zfxIfd/xLbfWdgGeDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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