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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d9c8e4fa6d0f582fbd68b90ae808c0c4940dceb3a874fcc6c47351b30c5f19' 
  AND token = 'yzKRbv5cGM7CDdo/AVDYGqpIqbyqmMxMDBev4A1zJYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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