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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2692dde3b8833ee7e34205e5c203545285f6ae9d971fcd4d2422c250f46130f' 
  AND token = 'H/JX8M0mCTM0SjRtz2oWnrB+FU8Qxoppm9enrN4ppd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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