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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056c1dc554f94cd9dca3d3cd7ad3d6265bce4004a10a6d17573b92fd5c4d83ea' 
  AND token = 'UbwZRQVI32xGKjGE1KHzf/uyxYHgb603ecG+MkvsvIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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