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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d98a14d190e7e5d3243d888a2636de8102f3323ad325000b562902974347efe' 
  AND token = 'EtKwSboOoo32dZlDI9nJgtTdZL0OKk7lCp9ddISReZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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