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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b0ef6772e87c949addf215639b10bb13edec9f0e1e85b339c3535f5dd44e56' 
  AND token = '4BX/8D39JoBK6kWit6DpBwg6vpN6X4ClXVJV9HUnKxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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