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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d9474c0155ba951cf6f4dc41f5b75ec5f280a7ee69d10abc4fd5ad3fe10b41' 
  AND token = '3I9ViI1mPzXddhnxDcWfsH8gym9kIE33hwMIsfeaN8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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