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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f8ebe70e1511d479b823ca9fe60e495b402203ef85f5ad0a71636118281a7c' 
  AND token = 'k/KdUPn8m18IDg38Wj/3PSFo9U/JgeFG6VeU7CFB2i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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