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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c8b4aa576c256de75bf45013a3a3b30f39e2c7a71a4fbc052a890a68df3fc6' 
  AND token = 'H8QEDMf9wT0uuAHx4e+G8bU9To+JX3F7SHllfRyrtOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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