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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cfd6a1c687d1cf5ce10d19b241a02cd60b9d8b72f1bc7023153a6a8c3eda0c' 
  AND token = 'bXb2pm6/0Hp9cF54Nl8rf7TQ7XWXelkt7zf7GFo2AuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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