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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dbf1ab22262bb0f7655f393b4021e92cb8b3472f40e82d36f314cfa1023848' 
  AND token = 'A5boSajxDzcoIc8VlAp7ITyfs/57PGq2RsDMHUzKV5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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