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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8fcac7091cfbdc91b2ce3fc1e8b40e9a2cdd8335acec68b682f977ea016b3a' 
  AND token = 'aLFg/qsPM+999QJRFaDwpv9SCH54WnykrAA2+Y2WxSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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