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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb67a47464699ee36eae0a30e76d36a3003f78f1c0a763d768db3c1ed06773a' 
  AND token = 'nn5TFcF7cDh9L8UGStpuZfyCovrxGcz1QwHrqtZhKSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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