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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7bc07206c619edf2bf071c4feed9526df04ed4fc6b6d85d5739cd41e829be6' 
  AND token = 'c9qwNhKMVbb0JaCYm5YOfhiq2h4MxWRmTvvR1jvvYhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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