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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f9b8244e6e7e89638907fdd6caeac4bdc74ea848303b1631041d54ee29075e' 
  AND token = 'DMn9iPq5quSRxP5EYw7CJraDzIT/CYexmivU7q/94t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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