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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55aff9dd368d297d2686b3d47c63fccead2ded1992e35b6350857a4feb5faf70' 
  AND token = '9rCA8NC0RxZxV2zADqBjECm27cduuJ3UCyGUhc3U/SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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