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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5812a3db9b4a9e8790caa0f870058fe8ddf4d901ccb21c8600530d9d29437aa9' 
  AND token = 'KX1fvnnOHAjdqtno0mZDA0plnDPovq/twQu91DM5OHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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