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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e4069a80a943bfa4815fcfd0c256e6d1efae8b18e0b67bc92ceb46d73a2edb' 
  AND token = 'nciUCDnQ1R5LWqS1/XGpTGxxoQpupRnfF550PlrZ8ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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