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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5d607fa7930e7de97c4d266ecb4632309dd0f325159ba64607a919d276cbaa' 
  AND token = 'BgT5a8YgY3gTwSic9sObGNncHTPp0UER/rtkfJ9+UE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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