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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1e2a98a8c85c79f4bb8851f35d1e9cf45b139d5d4f3fae3837b3072d2c5f96' 
  AND token = 'tgTjIuhYDSTb5eUROA13JY8gZaulg0f0D5P5zJ1gqJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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