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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e94459c7342660e26c1e9a3cb79bb495c3bef4794b8c91b6d6ddcdaf75d442' 
  AND token = 'iYS1sM4QloJvB/PCvOq5XauHpor1nWoUUdy+p3FnGk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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