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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d170bc768a2011e5beae54565a2d28726db24c8e90686f81bf9a81eeeb5314d' 
  AND token = 'h1LFQAoUQT6GB4XvjxTccwUFjOFYuchhwC9veVdfJSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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