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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c80fd86c9a3e2df1d17fa511273955c2d1c24527b6b2b222253279407d54b5' 
  AND token = 'c3DQSv7LlNcyKQvPoJ4HqmUpMmhbHFDP9TvfkH3yqDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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