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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df73507163c353be3a4d629ff5a9bf434f280bc43cd2174df8d5a403f0127fc1' 
  AND token = '97AL1TTcEcH8OU5OGfZO5rt15/xeNU1EhYfOWQr2eoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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