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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73761aaef1c8131696e388c50d89e2fb7729831e59e9cb26a05c354c5b3ec691' 
  AND token = 'ylHR5sSdLzfx4d6fbxxq5ERYMJes/0k18ZlMuxEh4zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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