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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba82f63779847acdf3c440f42b32bed480adf5a7024860f402a8d4ca6ae56e91' 
  AND token = 'UNW6MjeoKNaNgkAPkDhcP+A04W/GKHa9MbRgTtfr8Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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