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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de327be6a91e48ad917f0ccbd1728812cb4ac73e85c5e9d08c4b501739b3061' 
  AND token = 'Vs7PI0KJ545YG2xvk8CUaOmG5VSGV//WYbrkkuExSrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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