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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfaf9d45f25d9ac3dfb4e7f927752c1840d93ebf1e00053955d59f6962bd478' 
  AND token = 'icVVc+H5rS4Kd4AwVFIc8J2i9Ytdf2WABc3lOyBfENY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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