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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade2baebf934cfff4f231f85ee7727f70c9aa4e8a7d79002210f55802f4304c5' 
  AND token = '60s3hSJNi/MjnfFlrInjjtlwQN/GC/0Bod2UkOZnMdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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