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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266f0bfbd9b0153299b4ee6caff8b03f0494b0a887598889b305648c26e8fe76' 
  AND token = 'wdVmsfjzDeL4kFWpou+3DhYY8jpfw6c9bOKagCdLBH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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