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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36f51b77913801ba9176a306e1d9484d13d79a91cb98cc194a5b09cf1a6c264' 
  AND token = 'wTJnJKFQ2rQlppKB/+9p3evf5nchJAVFQ1sPoTW9hZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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