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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcea9b52cb4a043ab6048848b7549c4af58aaf68bcac17f104ef81ad340faff' 
  AND token = 'J3tJbWRfu2gizbDEwKJLRSP2BBu4Skc1cw8ItWcSp4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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